<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <script src="https://cdn.jsdelivr.net/npm/vue@2.6.14/dist/vue.js"></script>

</head>

<body>
  <div id="app">
    <ol>
      <todo-item v-for="item in sites" v-bind:todo="item"></todo-item>
    </ol>
  </div>
</body>
<script>
  Vue.component('todo-item', {
    props: {
      todo: Object,
      default: function () {
        return {message:'abcd'}
      }
    },
    template: '<li>{{todo.text}}</li>'
  })
  new Vue({
    el: '#app',
    data: {
      sites: [
        { text: 'runoob' },
        { text: 'google' },
        { text: 'taobao' },
      ]
    }
  })
</script>

</html>